21″ / 533 mm
Nominal diameter
28 Hz
Resonance
0.24
Q factor
97 dB
Sensitivity
± 9.5 mm
Linear excursion
1600 W
Program Power
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
96.9
dB
Frequency response
24 - 2000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
28.0
Hz
Mechanical quality factor
QMS
9.32
Electrical quality factor
QES
0.24
Total quality factor
QTS
0.24
Large signal parameters
Maximum linear excursion
xmax
9.5
mm
Air volume displaced at xmax
VD
1577
cm³
Power handling
P
1400
W
Program power
Pmax
1600
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.0
Ω
Inductance (1kHz)
LE
2.85
mH
VC Diameter
100
mm
Magnet
Force factor
Bl
33.5
N/A
Motor constant
Bl/√RE
15.0
N/√W
Diaphragm
Effective diameter
460
mm
Effective area
SD
1660
cm²
Moving mass
MMS
296
g
Moving mass (without air load)
MMD
248.5
g
Material
Weather protected
Suspensions
Stiffness
KMS
9.17
N/mm
Compliance
CMS
109
µm/N
Equivalent volume to the compliance
VAS
385
L
Mechanical resistance
RMS
5.59
N·s/m
Dimensions
Nominal diameter
21
″
533
mm
Overall diameter
545
mm
Baffle cutout diameter
492
mm
Overall depth
259
mm
Flange thickness
14
mm
Mounting depth
245
mm
Volume occupied by the driver (estimated)
11.0
L
Net weight
17.0
kg
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21″Subwoofer
fS
30 Hz
SD
1700 cm²
30 - 1000 Hz
QTS
0.26
xmax
13.0 mm
SPL1W
96 dB
Bl/√RE
15
Pmax
3000 W
18″Subwoofer
fS
30 Hz
SD
1220 cm²
28 - 2500 Hz
QTS
0.28
xmax
9.5 mm
SPL1W
96 dB
Bl/√RE
11
Pmax
1400 W
21″Subwoofer
fS
30 Hz
SD
1698 cm²
30 - 1000 Hz
QTS
0.27
xmax
10.5 mm
SPL1W
96 dB
Bl/√RE
16
Pmax
2000 W